Electrospectrometry of the Mouse Brain

To understand how electric field fluctuations organize within the brain, we developed deep electrospectroscopy, a method to assess possibly nonlinear spectral similarity between the local field potential of different areas. Applying this technique on recordings from nearly 500 areas of the mouse brain, we reveal an organization made of isolated landmarks and groups of spectrally similar areas. Such communities were mostly found in the forebrain and showed an organization that did not strictly follow the cytoarchitecture. For instance, visual parts of the cortex, colliculus and hippocampal regions were found in the same community. Electrospectral communities were also found to reshape with context, growing in size around brain areas required for a task. These analyses paint a detailed picture of the modularity underlying the structure and dynamics of electroencephalograms.